8721428975 has 24 divisors (see below), whose sum is σ = 12384207360. Its totient is φ = 5968458720.

The previous prime is 8721428953. The next prime is 8721428987. The reversal of 8721428975 is 5798241278.

It is not a de Polignac number, because 8721428975 - 2¹⁴ = 8721412591 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38486 + ... + 137564.

It is an arithmetic number, because the mean of its divisors is an integer number (516008640).

Almost surely, 2^8721428975 is an apocalyptic number.

8721428975 is a deficient number, since it is larger than the sum of its proper divisors (3662778385).

8721428975 is a wasteful number, since it uses less digits than its factorization.

8721428975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99599 (or 99594 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 53.

The square root of 8721428975 is about 93388.5912464686. The cubic root of 8721428975 is about 2058.3973596363.

The spelling of 8721428975 in words is "eight billion, seven hundred twenty-one million, four hundred twenty-eight thousand, nine hundred seventy-five".